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"This paper investigates various aspects of intonation and phonation in young adults with Down syndrome. The speech of nine speakers with Down syndrome was analyzed acoustically for different aspects of intonation and phonation," scientists in London, the United Kingdom report (see also Down Syndrome).
"The results of these analyses were compared to similar speech samples of nine typical speakers of Standard British English. The controls were matched for age and gender. Different aspects of speakers' individual pitch framework were analyzed, ie, organic and linguistic pitch ranges, Voice compass, and declination. Phonation was investigated acoustically as maximum phonation time, jitter, and shimmer. The results Suggest that speakers with Down syndrome exhibit normal respiratory capacity, a reduced organic pitch range, and a somewhat reduced linguistic pitch range. In terms of the melodic Variation in the intonation patterns, a higher mean speaking fundamental frequency was found with generally a less melodious rendering of the intonation contours and a shallower declination. The analysis of phonation indicated reduced jitter, while shimmer did not deviate ...
Source: HighBeam Research, Scientists at University of London discuss research in Down syndrome.